CN114088262B - Hollow inclusion stress meter with visual guiding and positioning functions and use method thereof - Google Patents
Hollow inclusion stress meter with visual guiding and positioning functions and use method thereof Download PDFInfo
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- CN114088262B CN114088262B CN202111411309.6A CN202111411309A CN114088262B CN 114088262 B CN114088262 B CN 114088262B CN 202111411309 A CN202111411309 A CN 202111411309A CN 114088262 B CN114088262 B CN 114088262B
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- 230000000007 visual effect Effects 0.000 title claims description 18
- 238000000034 method Methods 0.000 title claims description 17
- 239000003822 epoxy resin Substances 0.000 claims abstract description 43
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 43
- 239000000853 adhesive Substances 0.000 claims abstract description 40
- 230000001070 adhesive effect Effects 0.000 claims abstract description 40
- 239000003292 glue Substances 0.000 claims abstract description 38
- 239000011435 rock Substances 0.000 claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 12
- 238000005553 drilling Methods 0.000 claims description 74
- 238000007789 sealing Methods 0.000 claims description 22
- 238000013459 approach Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 1
- 235000017491 Bambusa tulda Nutrition 0.000 claims 1
- 241001330002 Bambuseae Species 0.000 claims 1
- 239000004593 Epoxy Substances 0.000 claims 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 1
- 239000011425 bamboo Substances 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 claims 1
- 239000004033 plastic Substances 0.000 claims 1
- 238000001125 extrusion Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2287—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges constructional details of the strain gauges
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/16—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force
- G01L5/161—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force using variations in ohmic resistance
- G01L5/1627—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force using variations in ohmic resistance of strain gauges
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The hollow inclusion stress gauge comprises a guide head, an epoxy resin cylinder, a piston cylinder and a tail plug, wherein a high-definition camera with an LED illuminating lamp is arranged at the top of the guide head, a glue guide blind hole is formed in the axis of the rear part of the guide head, a plurality of radial glue outlet holes communicated with the glue guide blind hole are formed in the outer circumference of the guide head, a connector, the piston cylinder and the tail plug are sequentially arranged at the rear part of the epoxy resin cylinder, a large hole and a small hole are drilled in a rock stratum according to test requirements, an adhesive is injected into the piston cylinder, the tail plug is screwed in the piston, and the air duct is used for inflating inwards.
Description
Technical Field
The invention belongs to the technical field of ground stress detection, and particularly relates to a hollow inclusion with a visual guiding and positioning function.
Background
The hollow inclusion stress meter method is a ground stress measuring method recommended by the International Society of Rock Mechanics (ISRM), and has the advantages of simple operation, high precision, capability of measuring the size and distribution of a three-dimensional stress field and the like compared with other ground stress measuring methods. However, in the actual testing process of the ground stress, the following difficulties are encountered that (1) the hollow inclusion stress meter cannot accurately guide and feed into the small borehole, (2) the integrity of the rock stratum around the stress meter on the inner wall of the small borehole is difficult to judge, and (3) whether the feeding position of the hollow inclusion stress meter is accurate or not. Therefore, the development of the hollow inclusion stress meter with the visual guiding and positioning functions has important significance for improving the success rate of the hollow inclusion ground stress test.
Disclosure of Invention
Technical problems: the invention aims to overcome the defects in the prior art and provide a hollow inclusion stress meter with a visual guiding and positioning function and a use method thereof, wherein the hollow inclusion stress meter can accurately guide, accurately position and smoothly convey the hollow inclusion stress meter into a small rock stratum drilling hole and judge the environment of the small rock stratum drilling hole.
The technical scheme is as follows: in order to achieve the aim, the hollow inclusion stress gauge with the visual guiding and positioning function comprises a guide head, an epoxy resin cylinder, a tail plug and a front sealing ring and a rear sealing ring, wherein a plurality of strain flowers are arranged on the epoxy resin cylinder, a high-definition camera is arranged at the front part of the guide head, a glue guiding blind hole is arranged at the rear axle center of the guide head, a plurality of radial glue outlet holes communicated with the glue guiding blind hole are formed in the outer circumference of the guide head, the rear end of the guide head is buckled at the front end of the epoxy resin cylinder, a connector, a piston cylinder and the tail plug are sequentially arranged at the rear part of the epoxy resin cylinder, the piston cylinder comprises a piston cylinder barrel with a front cavity containing adhesive and a piston arranged at the rear part of the adhesive, the front end of the connector is buckled at the rear end of the epoxy resin cylinder, the rear end of the connector is buckled at the front end of the piston cylinder barrel, and the tail plug is buckled at the rear end of the piston cylinder barrel; the connector is provided with a rubber guide hole communicated with the epoxy resin cylinder and the piston cylinder, and is provided with an access passage for a high-definition camera cable and a strain cable, the high-definition camera cable and the strain cable are respectively connected with the high-definition camera and a plurality of strain flowers through the access passage of the connector, the connector is also provided with a rubber guide hole communicated with the piston cylinder and the epoxy resin cylinder, the rubber guide hole is communicated with a rubber guide blind hole of the guide head through a rubber guide pipe, one end of the rubber guide pipe in the hollow hole of the epoxy resin cylinder is connected with the rubber guide hole in the connector through a rubber pipe connector, and the other end of the rubber guide pipe is connected with the rubber guide blind hole of the guide head through the rubber pipe connector; the tail plug shaft center is provided with a vent hole communicated with the piston cylinder barrel, and the vent hole is connected with an air duct through an air duct connector.
The camera of high definition digtal camera is located the central point of direction head, is equipped with a plurality of LED lamps around the camera.
The front sealing ring and the rear sealing ring comprise a front sealing ring arranged on the guide head and a rear sealing ring arranged on the connecting head.
The number of the plurality of strain flowers of the epoxy resin cylinder is 2-4, the outer layer of the epoxy resin is coated on the strain flowers, and all the strain flower wires are led out from the small holes formed in the connector.
The front end of the connector is buckled with the rear end of the epoxy resin cylinder through glue connection, and the rear end of the connector is buckled with the front end of the piston cylinder through screw thread connection.
The piston is in movable fit with the piston cylinder, a plurality of annular grooves capable of being provided with sealing rings are formed in the outer cylindrical surface of the piston, and a circular ring which is convenient for installing and detaching the piston is arranged at one end of the piston, which faces the tail plug.
The rear part of the tail plug is provided with two pin shafts for bearing the thrust of the push rod.
The outer diameters of the guide head, the epoxy resin cylinder, the tail plug, the connector and the piston cylinder are all equal and are 35mm.
The application method of the hollow inclusion stress meter with the visual guiding and positioning function comprises the following steps:
a. according to the test requirement, a large drilling hole with the diameter of 130mm is formed in the rock stratum according to the set depth dimension, and then a small drilling hole with the diameter of 36mm is formed inwards at the bottom of the large drilling hole according to the set depth dimension;
b. unscrewing a tail plug of the hollow inclusion stress gauge, injecting a proper amount of adhesive into a piston cylinder barrel, then putting a piston into the piston cylinder barrel, screwing the tail plug, and connecting an air duct through an air duct connector;
c. the pushing rod and the hollow inclusion stress meter are connected into a whole through a pin, the pushing rod pushes the hollow inclusion stress meter to enter a large drilling hole formed in a rock stratum at first, and when the hollow ladle approaches the bottom of the large drilling hole, the position of a small drilling hole formed at the bottom of the large drilling hole is observed through a high-definition camera at the front part of the guide head;
d. the air pump or the pedal inflator is connected to one end of the inlet of the air duct, the air pressure of the air passing through the air duct to the rear cavity of the piston cylinder gradually rises along with the continuous air duct air supply of the air pump or the inflator, the piston is pushed to gradually move forward, under the extrusion of the piston, the adhesive in the front cavity of the piston cylinder is extruded from a plurality of radial adhesive outlet holes through the adhesive guide holes of the connector, the adhesive guide tube and the guide head adhesive guide blind hole, the adhesive enters the radial gap between the small drilling hole and the epoxy resin cylinder, and along with the continuous air supply to the rear cavity of the piston cylinder, the piston is pushed to continuously extrude the adhesive in the front cavity of the piston cylinder from the adhesive outlet hole to the radial gap in the small drilling hole more and more until the radial gap in the small drilling hole is filled, and the ground stress test requirement is met.
In the step c, if the relative positions of the guide head and the small drilling hole are deviated, the pushing direction of the pushing rod is adjusted to center the guide head and the small drilling hole, and then the hollow inclusion stress gauge is continuously pushed to slowly enter the small drilling hole; in the process of slowly entering the small drilling hole, observing the crack development condition of the inner wall of the small drilling hole through a high-definition camera at the front part of the guide head, and withdrawing the hollow inclusion stress gauge, replacing the position and re-drilling when the inner wall of the small drilling hole is excessively broken and the integrity of the inner wall of the small drilling hole cannot meet the requirement of the ground stress test;
if the drilling requirements are met, continuing to advance, and observing the small drilling hole through a preposed high-definition camera until the drilling hole reaches a target position
The beneficial effects are that: by adopting the technical scheme, the method is suitable for measuring the three-dimensional ground stress in the rock stratum, reveals the ground stress and distribution characteristics of the rock stratum under the coal mine, and provides a basis for reserving and supporting a stope. The high-definition camera at the top of the guide head can clearly observe the position of the small drilling hole opening, the hollow inclusion can be easily and freely fed into the small drilling hole, whether the hollow inclusion is installed in place or not can be clearly seen, and the crack development condition of the wall of the small drilling hole can be clearly observed.
In the process of measuring the ground stress by using the hollow inclusion stress meter, firstly, the hollow inclusion stress meter is required to be sent to a position in a required drilling hole, pushing the hollow inclusion stress meter (with the diameter of 35 mm) into a large drilling hole with the diameter of 130mm is easy, when the hollow inclusion stress meter is required to enter a small drilling hole with the diameter of 36mm, because the drilling hole is in a black environment, an operator is difficult to see the position of the hole opening of the small drilling hole, the operator loses the target, and the operator can often repeatedly try for entering the small drilling hole. However, as the high-definition wide-angle camera with the LED lamp is arranged at the top of the guide head of the hollow inclusion stress meter, real-time data is transmitted to the computer through the data wire, and the position of the small drilling hole can be clearly displayed through the computer under the irradiation of the LED lamp, so that the hollow inclusion stress meter is smoothly pushed into the small drilling hole, and the situation that the guide head touches the bottom of the large drilling hole due to the fact that the relative position of the guide head and the small drilling hole cannot be distinguished can be avoided, and the strain gauge of the hollow inclusion is damaged due to blind pushing can be avoided. Before the hollow inclusion stress meter enters a small borehole, whether rock slag in the borehole is cleaned up or not can be clearly seen through a high-definition camera, and if not, the hollow inclusion stress meter is cleaned up again; in the process of pushing the hollow inclusion stress meter into the small borehole, the crack development condition of the rock stratum on the inner wall of the borehole can be seen clearly through the high-definition camera, and if the integrity of the rock stratum cannot meet the requirement, the hole is punched again; the high-definition camera can be used for clearly judging the reaching position of the top of the guide head of the hollow bag body, and accurately judging whether the hollow bag body is in place. The device has the advantages of simple structure, convenient operation and use, accurate guiding and positioning, and wide practicability in the technical field.
Drawings
Fig. 1 is a schematic diagram of an embodiment of the present invention.
Fig. 2 is a schematic structural view of the present invention.
Fig. 3 is a schematic view of the structure of the high-definition camera of the present invention.
Fig. 4 is a schematic view of the piston structure of the present invention.
In the figure: the high-definition camera, 2-guide head, 3-front sealing ring, 4-epoxy resin cylinder, 5-connector, 6-rear sealing ring, 7-high-definition camera cable, 8-strain cable, 9-piston cylinder, 10-piston, 11-tail plug, 12-pin, 13-air duct, 14-glue outlet hole, 15-glue guiding blind hole, 16-glue guiding tube connector, 17-glue guiding tube, 18-strain flower, 19-glue guiding tube connector, 20-connector glue guiding hole, 21-air duct connector, 22-small drilling hole, 23-large drilling hole, 24-rock stratum, 25-pushing rod, 101-camera, 102-LED lamp and 1001-circular ring.
Detailed Description
An embodiment of the invention is further described below with reference to the accompanying drawings:
the hollow inclusion stress meter with the visual guiding and positioning function mainly comprises a guiding head 2, an epoxy resin cylinder 4, a connector 5, a piston cylinder, a tail plug 11 and front and rear sealing rings, wherein the epoxy resin cylinder 4 is provided with a plurality of strain gauges 18, the number of the strain gauges is 2-4, the strain gauges are coated with an epoxy resin outer layer, and all strain gauge wires are led out from small holes formed in the connector 5. The front part of the guide head 2 is provided with a high-definition camera 1, a camera 101 of the high-definition camera 1 is positioned at the center of the guide head 2, and a plurality of LED lamps 102 are arranged around the camera 101; the front sealing ring and the rear sealing ring comprise a front sealing ring 3 arranged on the guide head 2 and a rear sealing ring 6 arranged on the connector 5. The rear axle center of the guide head 2 is provided with a glue guiding blind hole 15, the outer circumference of the guide head 2 is provided with a plurality of radial glue outlet holes 14 communicated with the glue guiding blind hole 15, the rear end of the guide head 2 is buckled at the front end of the epoxy resin cylinder 4, the rear part of the epoxy resin cylinder 4 is sequentially provided with a connector 5, a piston cylinder and a tail plug 11, the piston cylinder comprises a piston cylinder 9 with a front cavity containing adhesive and a piston 10 arranged at the rear part of the adhesive, the front end of the connector 5 is buckled at the rear end of the epoxy resin cylinder 4, the rear end of the connector 5 is buckled at the front end of the piston cylinder 9, the piston 10 is in movable fit with the piston cylinder 9, the outer cylindrical surface of the piston 10 is provided with a plurality of annular grooves capable of mounting sealing rings, and one end of the piston 10, which faces the tail plug 11, is provided with a ring 1001 which is convenient for mounting and dismounting the piston. The piston 10 extrudes the adhesive in the front cavity of the piston cylinder 9 under the pushing of the air entering from the vent hole of the tail plug 11, so that the adhesive is sent into the adhesive guiding blind hole 15 on the guide head 2 through the adhesive guiding hole 20 of the connector and the adhesive guiding pipe 17. The tail plug 11 is buckled at the rear end of the piston cylinder 9, and two pin shafts 12 for bearing the thrust of the pushing rod 25 are arranged at the rear part of the tail plug 11. The connector 5 is provided with a connector glue guiding hole 20 for communicating the epoxy resin cylinder 4 and the piston cylinder 9, and is provided with an access passage for the high-definition camera cable 7 and the strain wire cable 8, the front end of the connector 5 is buckled with the rear end of the epoxy resin cylinder 4 through glue connection, and the rear end of the connector 5 is buckled with the front end of the piston cylinder 9 through screw thread connection. The high-definition camera cable 7 and the strain flower cable 8 are respectively connected with the high-definition camera 1 and a plurality of strain flowers 18 through the inlet and outlet passages of the connector 5, the connector 5 is also provided with a glue guiding hole 20 for communicating a piston cylinder and the epoxy resin cylinder 4, a glue outlet of the epoxy resin cylinder 4 is communicated with a glue guiding blind hole 15 of the guide head 2 through a glue guiding pipe 17, one end of the glue guiding pipe 17 in the hollow hole of the epoxy resin cylinder is connected with the glue guiding hole in the connector 5 through a glue pipe joint 19, and the other end is connected with the glue guiding blind hole of the guide head 2 through a glue pipe joint 16; the axis of the tail plug 11 is provided with a vent hole communicated with the piston cylinder 9, and the outside of the vent hole is connected with the air duct 13 through an air duct connector 21. The outer diameters of the guide head 2, the epoxy resin cylinder 4, the tail plug 11, the connector 5 and the piston cylinder 9 are all equal and are 35mm.
The application method of the hollow inclusion stress meter with the visual guiding and positioning function comprises the following steps:
a. according to the test requirement, a large drilling hole 23 with the diameter of 130mm is formed in the rock stratum 24 according to the set required depth dimension, and then a small drilling hole 22 with the diameter of 36mm is formed inwards at the bottom of the large drilling hole 23 according to the set required depth dimension;
b. unscrewing a tail plug 11 of the hollow inclusion stress gauge, injecting a proper amount of adhesive into a piston cylinder barrel, then putting a piston 10 into the piston cylinder barrel, screwing the tail plug 11, and connecting an air duct 13 through an air duct connector 21;
c. the pushing rod 25 and the hollow inclusion stress meter are connected into a whole through the pin 12, the pushing rod 25 pushes the hollow inclusion stress meter to enter a large drilling hole 23 formed in a rock stratum 24 at first, and when the hollow inclusion is close to the bottom of the large drilling hole 23, the position of a hole opening of a small drilling hole 22 formed in the bottom of the large drilling hole 23 is observed through a high-definition camera 1 at the front part of the guide head 2;
if the relative positions of the guide head 2 and the orifice of the small drilling hole 22 deviate, the pushing direction of the pushing rod 25 is adjusted to center the guide head 2 and the small drilling hole 22, and then the hollow inclusion stress gauge is continuously pushed to slowly enter the small drilling hole 22; in the process of slowly entering the small drilling hole 22, observing the crack development condition of the inner wall of the small drilling hole 22 through the high-definition camera 1 at the front part of the guide head 2, and withdrawing the hollow inclusion stress gauge, replacing the position and re-drilling when the inner wall of the small drilling hole 22 is excessively broken and the integrity of the small drilling hole cannot meet the requirement of the ground stress test;
if the requirements are met, continuing to advance, and observing the small drilling hole 22 through the front high-definition camera 1 until the small drilling hole reaches a target position;
d. an air pump or a pedal inflator is connected to one end of the inlet of the air duct 13, along with the continuous air supply of the air pump or the inflator to the air duct 13, the air pressure reaching the rear cavity of the piston cylinder 9 through the air duct 13 is gradually increased, the piston 10 is pushed to gradually move forward, under the extrusion of the piston 10, the adhesive in the front cavity of the piston cylinder 9 is extruded from a plurality of radial adhesive outlet holes 14 through the connector adhesive guide holes 20, the rubber guide pipes 17 and the guide head adhesive guide blind holes 15, the adhesive enters the radial gaps between the small drilling holes 22 and the epoxy resin cylinder, and along with the continuous air supply entering the rear cavity of the piston cylinder 9, the piston 10 is continuously pushed to continuously extrude the adhesive in the front cavity of the piston cylinder 9 from the adhesive outlet holes 14 to the radial gaps in the small drilling holes more and more until the radial gaps in the small drilling holes are filled, and the ground stress test requirements are met.
Claims (10)
1. The utility model provides a hollow inclusion stress meter with visual direction locate function, includes direction head (2), epoxy section of thick bamboo (4), tail stopper (11) and front and back sealing washer, its characterized in that: the novel high-definition plastic rubber sealing device is characterized in that a plurality of strain flowers (18) are arranged on the epoxy resin cylinder (4), a high-definition camera (1) is arranged at the front part of the guide head (2), a rubber guiding blind hole (15) is arranged at the rear axle center of the guide head (2), a plurality of radial rubber outlet holes (14) communicated with the rubber guiding blind hole (15) are formed in the outer circumference of the guide head (2), the rear end of the guide head (2) is buckled at the front end of the epoxy resin cylinder (4), a connector (5), a piston cylinder and a tail plug (11) are sequentially arranged at the rear part of the epoxy resin cylinder (4), the piston cylinder comprises a piston cylinder barrel (9) with a front cavity filled with adhesive and a piston (10) arranged at the rear part of the adhesive, the front end of the connector (5) is buckled at the rear end of the epoxy resin cylinder (4), and the tail plug (11) is buckled at the rear end of the piston cylinder barrel (9); the connector (5) is provided with a connector glue guiding hole (20) for communicating the epoxy resin cylinder (4) with the piston cylinder (9), and is provided with a feeding and discharging channel for the high-definition camera cable (7) and the strain flower cable (8), the high-definition camera cable (7) and the strain flower cable (8) are respectively connected with the high-definition camera (1) and the strain flower (18) through the feeding and discharging channel of the connector (5), the connector (5) is also provided with a glue guiding hole (20) for communicating the piston cylinder and the epoxy resin cylinder (4), a glue outlet of the epoxy resin cylinder (4) is communicated with a glue guiding blind hole (15) of the guide head (2) through a glue guiding pipe (17), one end of the glue guiding pipe (17) in the hollow hole of the epoxy resin cylinder is connected with the glue guiding hole in the connector (5) through a glue guiding pipe joint II (19), and the other end of the epoxy resin cylinder is connected with the glue guiding blind hole in the guide head (2) through a glue guiding pipe joint II (16); the axis of the tail plug (11) is provided with a vent hole communicated with the piston cylinder barrel (9), and the outside of the vent hole is connected with the air duct (13) through an air duct connector (21).
2. The hollow inclusion stress gauge with visual guiding and positioning functions according to claim 1, wherein: the camera (101) of the high-definition camera (1) is located at the center of the guide head (2), and a plurality of LED lamps (102) are arranged around the camera (101).
3. The hollow inclusion stress gauge with visual guiding and positioning functions according to claim 1, wherein: the front sealing ring and the rear sealing ring comprise a front sealing ring (3) arranged on the guide head (2) and a rear sealing ring (6) arranged on the connector (5).
4. The hollow inclusion stress gauge with visual guiding and positioning functions according to claim 1, wherein: the epoxy resin cylinder (4) is provided with 2-4 strain flowers, the strain flowers are coated with an epoxy resin outer layer, and all strain flower wires are led out from small holes formed in the connector (5).
5. The hollow inclusion stress gauge with visual guiding and positioning functions according to claim 1, wherein: the front end of the connector (5) is buckled with the rear end of the epoxy resin cylinder (4) through glue connection, and the rear end of the connector (5) is buckled with the front end of the piston cylinder (9) through screw connection.
6. The hollow inclusion stress gauge with visual guiding and positioning functions according to claim 1, wherein: the piston (10) is in movable fit with the piston cylinder (9), a plurality of annular grooves capable of being provided with sealing rings are formed in the outer cylindrical surface of the piston (10), and a circular ring (1001) which is convenient for installing and detaching the piston is arranged at one end of the piston (10) facing the tail plug (11).
7. The hollow inclusion stress gauge with visual guiding and positioning functions according to claim 1, wherein: the rear part of the tail plug (11) is provided with two pins (12) for bearing the thrust of the pushing rod (25).
8. The hollow inclusion stress gauge with visual guiding and positioning functions according to claim 1, wherein: the outer diameters of the guide head (2), the epoxy resin cylinder (4), the tail plug (11), the connector (5) and the piston cylinder (9) are all equal and are 35mm.
9. A method of using the hollow inclusion stressmeter with visual guidance and positioning function according to any of claims 1-8, comprising the steps of:
a. according to the test requirement, a large drilling hole (23) with the diameter of 130mm is formed in a rock stratum (24) according to the set required depth dimension, and then a small drilling hole (22) with the diameter of 36mm is formed inwards at the bottom of the large drilling hole (23) according to the set required depth dimension;
b. unscrewing a tail plug (11) of the hollow inclusion stress meter, injecting a proper amount of adhesive into a piston cylinder barrel, then putting the piston (10), screwing the tail plug (11), and connecting an air duct (13) through an air duct connector (21);
c. the pushing rod (25) and the hollow inclusion stress meter are connected into a whole through the pin (12), the pushing rod (25) pushes the hollow inclusion stress meter to enter a large drilling hole (23) formed in a rock stratum (24) at first, and when the hollow inclusion approaches the bottom of the large drilling hole (23), the position of a small drilling hole (22) formed in the bottom of the large drilling hole (23) is observed through a high-definition camera (1) in the front of the guide head (2);
d. the air pump or the pedal inflator is connected to one end of the inlet of the air duct (13), the air pressure of the rear cavity of the piston cylinder (9) is gradually increased along with the continuous air transmission of the air pump or the inflator to the air duct (13), the piston (10) is pushed to gradually move forward, the air entering through the vent hole of the tail plug (11) pushes the adhesive in the front cavity of the piston cylinder (9) downwards, the adhesive is sent into the adhesive guide blind hole (15) on the guide head (2) through the connector adhesive guide hole (20) and the adhesive guide tube (17), the adhesive is extruded from the radial adhesive guide holes (14), the adhesive enters into the radial gap between the small drill holes (22) and the epoxy resin cylinder, and the adhesive continuously pushes the front cavity of the piston cylinder (9) to be extruded from the adhesive guide hole (14) to enter into the radial gap of the small drill holes until the radial gap of the small drill holes is filled up, and the radial gap of the small drill holes is satisfied, and the requirement of the ground stress test is met.
10. The method of use according to claim 9, wherein: in the step c, if the relative positions of the guide head (2) and the orifice of the small drilling hole (22) deviate, the pushing direction of the pushing rod (25) is adjusted at the moment to center the guide head (2) and the small drilling hole (22), and then the hollow inclusion stress meter is continuously pushed to slowly enter the small drilling hole (22); in the process of slowly entering the small drilling hole (22), observing the crack development condition of the inner wall of the small drilling hole (22) through a high-definition camera (1) at the front part of the guide head (2), and withdrawing the hollow inclusion stress gauge, replacing the position and re-drilling when the inner wall of the small drilling hole (22) is excessively broken and the integrity of the small drilling hole cannot meet the ground stress test requirement;
if the requirements are met, the propulsion is continued, and the small drilling holes (22) are observed through the front high-definition camera (1) until the target position is reached.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111411309.6A CN114088262B (en) | 2021-11-25 | 2021-11-25 | Hollow inclusion stress meter with visual guiding and positioning functions and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111411309.6A CN114088262B (en) | 2021-11-25 | 2021-11-25 | Hollow inclusion stress meter with visual guiding and positioning functions and use method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114088262A CN114088262A (en) | 2022-02-25 |
| CN114088262B true CN114088262B (en) | 2023-11-17 |
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| CN202111411309.6A Active CN114088262B (en) | 2021-11-25 | 2021-11-25 | Hollow inclusion stress meter with visual guiding and positioning functions and use method thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7513167B1 (en) * | 2006-06-16 | 2009-04-07 | Shosei Serata | Single-fracture method and apparatus for automatic determination of underground stress state and material properties |
| CN104390734A (en) * | 2014-12-02 | 2015-03-04 | 安徽恒源煤电股份有限公司 | Hollow inclusion stressometer |
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